数学不是一项观赏性运动。
不要等到一切都刚刚好。它永远不会完美。总会有挑战、障碍和不太完美的条件。所以呢?现在就开始吧。随着你迈出的每一步,你会变得越来越强大,越来越熟练,越来越自信,越来越成功。
Facts do not speak for themselves. They speak for or against competing theories. Facts divorced from theories or visions are mere isolated curiosities.